If you received a letter from the future telling you everything that would happen, would you choose to change the future? The story takes place among six people. Each of them receives a letter from the future every week, which says that something important has happened and they should avoid doing it, otherwise something serious will happen. Time and time again, it is exactly as written in the letter. Is it a coincidence? Time passes little by little, until the death of a person makes them realize the seriousness...
Concept: The six protagonists each received letters written to themselves from the future. The events happened one after another just as written in the letters. Is it a coincidence? Or is the future looking down?